MIL-HDBK-660 Fabrication Of Rigid Waveguide Assemblies Sweep Bends And TwistsThis handbook is intended for the electronic installations technician to be used as a guide for fabricating rectangular waveguide bends and twists used in the microwave region of the electronic spectrum.

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MIL-HDBK-660B

FIGURE 30.  Through flange on waveguide.

d.    The bore of the flange should be concentric with the waveguide bore to within .005 inch (0.13 mm) (see figure 31).  The flange face should be perpendicular ± .5 degree to the edge and side planes of the internal surfaces of the waveguide (see figure 32).

5.5.2  Assembly of choke or socket flanges to waveguide.  When installing choke or socket flanges to the waveguide, the following method should be used (see figure 33):

a.    The surface to be brazed must be thoroughly clean (see 5.4). b.    Repeat 5.5.1b.

c.    The waveguide must be square in all three planes to within ± .5 degree before assembly (see figure 34).

FIGURE 31.  Concentricity of waveguide and flange.

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